M.C.
It's just a phase--she's probably just really proud of herself and practicing her new (annoying:) skill. My daughter did the same thing at around the same time and it had nothing to do with potty readiness (she's almost 2 1/2 and still no interest in the potty)--she just thought it was cool to take her diaper off and even cooler because it got me fired up. I just ignored it and she eventually stopped when she got no reaction. Beware though, she'll stop with the diaper, and then move on to mastering taking her clothes on and off, putting on her own shoes etc. Good luck!